#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#define CONV(v) (struct sockaddr*)(v)

#include <string>
#include <cstdint>
#include <cstring>
#include <memory>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "Log.hpp"

using namespace LogModule;


const static int gsockfd = -1;
const static std::string gdefaultip = "127.0.0.1";
const static uint16_t gdefaultport = 8080;


class UdpServer
{
public:
    UdpServer(std::string ip = gdefaultip, uint16_t port = gdefaultport)
    :_ip(ip)
    ,_port(port)
    ,_sockfd(gsockfd)
    ,_isrunning(false)
    {}

    void InitServer()
    {
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            exit(1);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd is: " << _sockfd;

        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        socklen_t len = sizeof(local);
        local.sin_family = AF_INET;
        local.sin_addr.s_addr = ::inet_addr(_ip.c_str());
        local.sin_port = ::htons(_port);

        int n = ::bind(_sockfd, CONV(&local), len);
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            exit(2);
        }
        LOG(LogLevel::INFO) << "bind success!";

    }

    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char inbuffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);

            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, CONV(&peer), &len);
            if (n > 0)
            {
                std::string clientip = ::inet_ntoa(peer.sin_addr);
                uint16_t clientport = ::ntohs(peer.sin_port);

                inbuffer[n] = 0;
                std::string clientinfo = clientip + ":" + std::to_string(clientport) + " # " + inbuffer;

                LOG(LogLevel::DEBUG) << clientinfo; 

                std::string echo_string = "echo# ";
                echo_string += inbuffer;

                ::sendto(_sockfd, echo_string.c_str(), echo_string.size(), 0, CONV(&peer), sizeof(peer));
            }

        }
        _isrunning =false;
    }

    ~UdpServer()
    {
        if (_sockfd > gsockfd)
            ::close(_sockfd);
    }

private:
    int _sockfd;
    uint16_t _port;
    std::string _ip;
    bool _isrunning;
};




#endif